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Selected Quarterly Financial Data - Schedule of Quarterly Financial Information (Parenthetical) (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Jan. 01, 2017 | Oct. 02, 2016 | Jul. 03, 2016 | Apr. 03, 2016 | Dec. 31, 2017 | Jan. 01, 2017 | Jan. 03, 2016
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Revaluation of net deferred tax assets | $ 5,500,000 |  |  |  |  |  |  |
Pre-tax non-cash impairment charge | 600,000 |  |  |  |  | $ 602,000 | $ 0 | $ 192,000
Non-cash goodwill impairment charge | 4,400,000 |  |  |  |  | 4,433,000 | $ 0 | $ 0
Write-offs (benefits) related to share based compensation |  | $ (400,000) |  | $ 200,000 | $ 700,000 |  |  |
Pretax charges of store closing costs |  |  | $ 1,100,000 | $ 100,000 |  |  |  |
California Enterprise Zone Tax Credits [Member] |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Provision for incomes taxes, excluding federal income tax benefit | $ 600,000 |  |  |  |  | $ 900,000 |  |
Net deferred tax asset related to enactment of tax cuts and jobs act [Member] |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in net income (loss) per share | $ (0.26) |  |  |  |  |  |  |
Valuation allowance related to unused California Enterprise Zone Tax Credits [Member] |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in net income (loss) per share |  |  |  |  |  | $ (0.03) |  |
Impairment charge [Member] |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in net income (loss) per share | $ (0.02) |  |  |  |  |  |  |
Increase (decrease) in net income (loss) | $ (400,000) |  |  |  |  |  |  |
Goodwill Impairment [Member] |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in net income (loss) per share | $ (0.21) |  |  |  |  |  |  |
Share based compensation [Member] |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in net income (loss) per diluted share |  | $ (0.02) |  | $ 0.01 | $ 0.03 |  |  |
Store closing costs [Member] |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in net income (loss) |  |  | $ (700,000) | $ (60,000) |  |  |  |
Increase (decrease) in net income (loss) per diluted share |  |  | $ (0.03) | $ 0.00 |  |  |  |

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